liba52/resample_c.c

   1 static inline int16_t convert (int32_t i)
   2 {
   3     if (i > 0x43c07fff)
   4         return 32767;
   5     else if (i < 0x43bf8000)
   6         return -32768;
   7     else
   8         return i - 0x43c00000;
   9 }
  10
  11 static int a52_resample_MONO_to_5_C(float * _f, int16_t * s16){
  12     int i;
  13     int32_t * f = (int32_t *) _f;
  14         for (i = 0; i < 256; i++) {
  15             s16[5*i] = s16[5*i+1] = s16[5*i+2] = s16[5*i+3] = 0;
  16             s16[5*i+4] = convert (f[i]);
  17         }
  18     return 5*256;
  19 }
  20
  21 static int a52_resample_MONO_to_1_C(float * _f, int16_t * s16){
  22     int i;
  23     int32_t * f = (int32_t *) _f;
  24         for (i = 0; i < 256; i++) {
  25             s16[i] = convert (f[i]);
  26         }
  27     return 1*256;
  28 }
  29
  30 static int a52_resample_STEREO_to_2_C(float * _f, int16_t * s16){
  31     int i;
  32     int32_t * f = (int32_t *) _f;
  33         for (i = 0; i < 256; i++) {
  34             s16[2*i] = convert (f[i]);
  35             s16[2*i+1] = convert (f[i+256]);
  36         }
  37     return 2*256;
  38 }
  39
  40 static int a52_resample_3F_to_5_C(float * _f, int16_t * s16){
  41     int i;
  42     int32_t * f = (int32_t *) _f;
  43         for (i = 0; i < 256; i++) {
  44             s16[5*i] = convert (f[i]);
  45             s16[5*i+1] = convert (f[i+512]);
  46             s16[5*i+2] = s16[5*i+3] = 0;
  47             s16[5*i+4] = convert (f[i+256]);
  48         }
  49     return 5*256;
  50 }
  51
  52 static int a52_resample_2F_2R_to_4_C(float * _f, int16_t * s16){
  53     int i;
  54     int32_t * f = (int32_t *) _f;
  55         for (i = 0; i < 256; i++) {
  56             s16[4*i] = convert (f[i]);
  57             s16[4*i+1] = convert (f[i+256]);
  58             s16[4*i+2] = convert (f[i+512]);
  59             s16[4*i+3] = convert (f[i+768]);
  60         }
  61     return 4*256;
  62 }
  63
  64 static int a52_resample_3F_2R_to_5_C(float * _f, int16_t * s16){
  65     int i;
  66     int32_t * f = (int32_t *) _f;
  67         for (i = 0; i < 256; i++) {
  68             s16[5*i] = convert (f[i]);
  69             s16[5*i+1] = convert (f[i+512]);
  70             s16[5*i+2] = convert (f[i+768]);
  71             s16[5*i+3] = convert (f[i+1024]);
  72             s16[5*i+4] = convert (f[i+256]);
  73         }
  74     return 5*256;
  75 }
  76
  77 static int a52_resample_MONO_LFE_to_6_C(float * _f, int16_t * s16){
  78     int i;
  79     int32_t * f = (int32_t *) _f;
  80         for (i = 0; i < 256; i++) {
  81             s16[6*i] = s16[6*i+1] = s16[6*i+2] = s16[6*i+3] = 0;
  82             s16[6*i+4] = convert (f[i+256]);
  83             s16[6*i+5] = convert (f[i]);
  84         }
  85     return 6*256;
  86 }
  87
  88 static int a52_resample_STEREO_LFE_to_6_C(float * _f, int16_t * s16){
  89     int i;
  90     int32_t * f = (int32_t *) _f;
  91         for (i = 0; i < 256; i++) {
  92             s16[6*i] = convert (f[i+256]);
  93             s16[6*i+1] = convert (f[i+512]);
  94             s16[6*i+2] = s16[6*i+3] = s16[6*i+4] = 0;
  95             s16[6*i+5] = convert (f[i]);
  96         }
  97     return 6*256;
  98 }
  99
 100 static int a52_resample_3F_LFE_to_6_C(float * _f, int16_t * s16){
 101     int i;
 102     int32_t * f = (int32_t *) _f;
 103         for (i = 0; i < 256; i++) {
 104             s16[6*i] = convert (f[i+256]);
 105             s16[6*i+1] = convert (f[i+768]);
 106             s16[6*i+2] = s16[6*i+3] = 0;
 107             s16[6*i+4] = convert (f[i+512]);
 108             s16[6*i+5] = convert (f[i]);
 109         }
 110     return 6*256;
 111 }
 112
 113 static int a52_resample_2F_2R_LFE_to_6_C(float * _f, int16_t * s16){
 114     int i;
 115     int32_t * f = (int32_t *) _f;
 116         for (i = 0; i < 256; i++) {
 117             s16[6*i] = convert (f[i+256]);
 118             s16[6*i+1] = convert (f[i+512]);
 119             s16[6*i+2] = convert (f[i+768]);
 120             s16[6*i+3] = convert (f[i+1024]);
 121             s16[6*i+4] = 0;
 122             s16[6*i+5] = convert (f[i]);
 123         }
 124     return 6*256;
 125 }
 126
 127 static int a52_resample_3F_2R_LFE_to_6_C(float * _f, int16_t * s16){
 128     int i;
 129     int32_t * f = (int32_t *) _f;
 130         for (i = 0; i < 256; i++) {
 131             s16[6*i] = convert (f[i+256]);
 132             s16[6*i+1] = convert (f[i+768]);
 133             s16[6*i+2] = convert (f[i+1024]);
 134             s16[6*i+3] = convert (f[i+1280]);
 135             s16[6*i+4] = convert (f[i+512]);
 136             s16[6*i+5] = convert (f[i]);
 137         }
 138     return 6*256;
 139 }
 140
 141
 142 static void* a52_resample_C(int flags, int ch){
 143     switch (flags) {
 144     case A52_MONO:
 145         if(ch==5) return a52_resample_MONO_to_5_C;
 146         if(ch==1) return a52_resample_MONO_to_1_C;
 147         break;
 148     case A52_CHANNEL:
 149     case A52_STEREO:
 150     case A52_DOLBY:
 151         if(ch==2) return a52_resample_STEREO_to_2_C;
 152         break;
 153     case A52_3F:
 154         if(ch==5) return a52_resample_3F_to_5_C;
 155         break;
 156     case A52_2F2R:
 157         if(ch==4) return a52_resample_2F_2R_to_4_C;
 158         break;
 159     case A52_3F2R:
 160         if(ch==5) return a52_resample_3F_2R_to_5_C;
 161         break;
 162     case A52_MONO | A52_LFE:
 163         if(ch==6) return a52_resample_MONO_LFE_to_6_C;
 164         break;
 165     case A52_CHANNEL | A52_LFE:
 166     case A52_STEREO | A52_LFE:
 167     case A52_DOLBY | A52_LFE:
 168         if(ch==6) return a52_resample_STEREO_LFE_to_6_C;
 169         break;
 170     case A52_3F | A52_LFE:
 171         if(ch==6) return a52_resample_3F_LFE_to_6_C;
 172         break;
 173     case A52_2F2R | A52_LFE:
 174         if(ch==6) return a52_resample_2F_2R_LFE_to_6_C;
 175         break;
 176     case A52_3F2R | A52_LFE:
 177         if(ch==6) return a52_resample_3F_2R_LFE_to_6_C;
 178         break;
 179     }
 180     return NULL;
 181 }